The answer to 'why is my shower leaking water' is that there are several common causes, including worn-out seals, loose fittings, cracks in the shower pan or tiles, and issues with the plumbing behind the walls. Symptoms of a shower leak can include water pooling on the floor, stains on the walls or ceiling below, and a musty smell.
Some potential solutions include replacing washers or seals, tightening fittings, repairing cracks or holes, and addressing any issues with the plumbing. However, it's important to properly diagnose the root cause before attempting a fix, as some shower leaks may require the expertise of a professional plumber, especially if the problem is behind the walls or involves complex plumbing work.